Protective cover for breathing apparatus



1,635,545 A. B. DRAGER PROTECTIVE COVER FORBREATHING APPARATUS I July12, 1927.

Filed Nov. 5. 0. 1,925

' fis I ATTORNEYS Patented July ALEXANDER ennlvnennnnlienng-or'VILUBECK, GERMANY,

PROTECTIVE oovnn ron BREATHING nr'rnnaros.

Application filed November 30, 1e25,, Seria1.No.72,144 and. in GermanyDeteabaf1, 192i. i

yThis invention relatestobreathing apparatus, and more particularly to aprotectlve .coverior such apparatus or parts thereof. I

, A protective cover or shield for breathing apparatus or parts thereofhas the dual function of not only protecting the apparatus covered butalso ventilating.and coolr ing such apparatus by permitting atmosphericor external air toipass through the said cover and to flow aroundsaidapparatus.

It has been proposed to use protective covers or shields which areeither perforated or punched, i. e. provided with slits or openings asin grids or lattice-workf The disadvantage. of these covers is that theypermit cooling and ventilation of the apparatus at the expense of theprotective efiect against external injuries. This loss of protective efiect means that parts of the apparatus are exposed to external agents.For instance, in the case of a nail protruding from timber worker asharp point of a stone projecting from amine wall, it is possible thatthe sharp end of either the nail or the stone may pass through one ofthe apertures I of the protective cover, and injure or punctur-e partsof the apparatus adjacent to said cover. 7 v

The object of this'invention is not only to eliminate the disadvantagesof known types of protective covers but also to provlde advantages whichwill be pointed out hereincooling apertures such that-a sharp pointedobject cannot penetrate into the interior of the apparatus. Thisprotection is eflected by disposing the metal or material forming thesaid cover so that the cooling apertures are transverse to said cover,and that asubstangered, 1. e. the p1O1GGt1011Sd21IlTOWS a are tiallyblank wall protects the said apparatus or parts thereof. Consequently,sharp oh- I jects merely strike this blank protecting wall withoutpenetrating the apertures and causing any injury to the internalapparatus.

The invention will lee-best understood from the following description ofseveral illustra tive examples thereof taken in conjunction with theaccompanying drawings forming a part of this specification, and, inwhich;-

Fig. 1 shows a rear elevation of an embodiment of this invention in theform of a hinged cover adapted to protect the carewe: shown 'in Fig; 1

Fig.4; shows a vertical section taken on line of Fig. 3; Q Fig. 5.shows, a horlzontal section takenon' Fig. 6 is a view similar tothat ofFig. 3

showing a modified form;

Fig. 7 is a vertical section vtakenon the line 77 of Fig. 6;

Fig. 8 is ahorizontal section taken on the line 88 of 6.

Similar characters of reference designate similar parts in each of theseveral views.

The reference character 0, as shown in Figs. 1 and 2, designates ahinged-cover which is made from-a piece of suitable sheet material,suc'has sheet metal, and is adapted to be fastened to a breathingapparatus to 1 protect the cartridge filter; The main body a of saidcover is provided with a pair of hinges or fastening means H and aplurality ofparallel cuts a arranged inlrows a and a In'the drawingseven of these rows are shown, but obviously any suitable number of rowswith any desirable distance therebe tween may be employed depending uponthe particular conditions. tions of metal between adjacent cuts are Thealternate porbulged into projections. 00 which form, with j the rest ofthe sheet, apertures oropenings a transverse tosaidcover. Thesepro edtions mayhave any desirable shape such as an arched section or a.rectangular section,

the arched section being shownin Figure 4...

The strip or portion. of metal a between said projections remains in theplane of the metal sheet a. In the illustration in Fig. 1,

the projections in alternate. rows are'stag I the projectionsa toincrease the ventilating or cooling effect,

the transverse openings may be enlarged by further vaulting or archlngthe edges a of In the form shown in Fig. 6, the transverse -apertureshave been made still greater by bulging the intermediate strips a inW'ardly to form projections 0 The transverse apertures a formed-b thesaid'projections a? and a may be clearly seen in 7. By this arrangement,the area of'the transverse apertu'resis practically doubled, and theventilation afforded thereby'greatly improved; It is to he noted thatthis type of cover provides increased ventilation to the coveredpart'ofthe apparatus Without diminishing or detracting from the protectiveefi'ect to said apparatus.

VVhi'le I have illustrated and described preferred forms of constructionfor carrying my invention-into effect, it is understood that variationsin embodiments may be made Without departing from the scope and spiritof the invention.

I claim: a A protective shield for a part of a breath ing apparatus,comprising'a metallic sheet forming a hinged cover adapted to fit over

